I debated, but went for it
I was replacing my tyres and thought it's a bit pricey to do the inner tubes as well... When I pulled the old tyres off, I immediately recognised I'd made the right call. I highly recommend that you use the tubes when changing tyres as well. Higher quality noticed some degradation in the old tubes, and while not necessary, certainly gives you peace of mind at 40+kph that you're on solid kit!